Low pressure glue injection machine

Abstract

The present invention discloses a low-pressure glue injection machine, which includes a material tank, a gear pump and a low-pressure feeding pump. The material tank is negatively pressurized, the first end of the gear pump is connected to the material tank through a pipeline, the second end of the gear pump is connected to a glue injection gun head through a pipeline to feed the glue injection gun head, the low-pressure feeding pump is located on the pipeline between the gear pump and the material tank, and the low-pressure feeding pump is used to extract the material in the material tank and convey the material to the gear pump at a positive pressure. The low-pressure glue injection machine provided by the present invention has the advantages of stable feeding and low failure rate.

Description

Technical Field

[0001] The invention relates to the technical field of glue injection equipment, in particular to a low-pressure glue injection machine. Background Art

[0002] In two-component low-pressure injection equipment, due to the negative pressure in the AB storage tanks, when the injection pressure is too high or the liquid level in the tank is low, the gear pump of material A or material B will be insufficient, which will change the ratio of material A and material B in the injection product, and ultimately cause the product to be unqualified. When the negative pressure in the raw material tank remains unchanged, when the raw material level in the storage tank becomes low or a large-flow injection process is required, the gear pump power needs to be increased to ensure constant gun head pressure. Under long-term operation, the gear pump may be insufficiently supplied and the servo motor may be overloaded. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems: the equipment feed is unstable. The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention proposes a low-pressure glue injection machine, which has the advantages of stable feed and low failure rate.

[0004] According to the low-pressure glue injection machine of the embodiment of the present invention, the low-pressure glue injection machine includes a material tank, a gear pump and a low-pressure feeding pump. The material tank is under negative pressure. The first end of the gear pump is connected to the material tank through a pipeline. The second end of the gear pump is connected to the glue injection gun head through a pipeline to supply material to the glue injection gun head. The low-pressure feeding pump is located on the pipeline between the gear pump and the material tank. The low-pressure feeding pump is used to extract the material in the material tank and convey the material to the gear pump at positive pressure.

[0005] The low-pressure glue injection machine according to the embodiment of the present invention has the advantages of stable feeding and low failure rate. The present application has the following advantages: by feeding the gear pump with a low-pressure feeding pump, the operating power of the gear pump is reduced, the service life of the gear pump is extended, the equipment operation is more stable, the feed pressure of the gear pump becomes positive pressure, and the operating power of the gear pump is reduced when the feeding pressure of the gun head is constant, so that the gear pump can stably feed the gun head under various extreme working conditions, so that the low-pressure glue injection machine can be applied to a more comprehensive variety of process product requirements.

[0006] In some embodiments, the low-pressure glue injection machine further includes a pressure transmitter, and the pressure transmitter is located at the feed port of the gear pump to detect the pressure of the feed port of the gear pump.

[0007] In some embodiments, a controller is further included, wherein the controller is electrically connected to the low-pressure feed pump and the pressure transmitter.

[0008] In some embodiments, the low-pressure glue injection machine further includes an accumulator, and the accumulator is connected to a pipeline of a feed port of the gear pump to reduce pressure fluctuations in the pipeline.

[0009] In some embodiments, the low-pressure glue injection machine further includes a thermal relay, and the thermal relay is arranged on the gear pump and / or the low-pressure feed pump.

[0010] In some embodiments, the low-pressure glue injection machine further includes a safety valve, which is arranged on a pipeline at the outlet of the gear pump.

[0011] In some embodiments, the low-pressure glue injection machine further includes a filtering device, and the filtering device is located on the pipeline between the low-pressure feeding pump and the gear pump.

[0012] In some embodiments, the filtering device comprises a filtering barrel, a filtering net is arranged in the filtering barrel, the filtering net is detachably connected to the filtering barrel, and an inlet and an outlet are arranged at the top and the bottom of the filtering barrel respectively.

[0013] In some embodiments, the low-pressure glue injection machine further includes two pressure sensors, which are respectively arranged at the inlet and the outlet to detect the pressure difference of the filter barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of a low-pressure glue injection machine according to an embodiment of the present invention.

[0015] Figure 2 yes Figure 1 A partial enlarged schematic diagram of .

[0016] Figure numerals: 1. material tank; 2. gear pump; 3. low-pressure feed pump; 4. pressure transmitter. DETAILED DESCRIPTION

[0017] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0018] According to the low-pressure glue injection machine of the embodiment of the present invention, the low-pressure glue injection machine includes a material tank 1, a gear pump 2 and a low-pressure feed pump 3. The material tank 1 is in negative pressure. The first end of the gear pump 2 is connected to the material tank 1 through a pipeline. The second end of the gear pump 2 is connected to the glue injection gun head through a pipeline to supply materials to the glue injection gun head. The low-pressure feed pump 3 is located on the pipeline between the gear pump 2 and the material tank 1. The low-pressure feed pump 3 is used to extract the material in the material tank 1 and convey the material to the gear pump 2 at positive pressure. The material tank 1 is in a negative pressure state, and the low-pressure feed pump 3 conveys the material outward, so that the feed pressure of the gear pump 2 is a stable positive pressure, which reduces the compliance of the gear pump 2. The cooperation of the two pumps reduces the load of the pump, adapts to the needs of various process products, and can also stably supply materials under extreme working conditions.

[0019] The low-pressure glue injection machine according to the embodiment of the present invention has the advantages of stable material supply and low failure rate.

[0020] In some embodiments, the low-pressure glue injection machine further includes a pressure transmitter, and the pressure transmitter is located at the feed port of the gear pump 2 to detect the pressure of the feed port of the gear pump 2 .

[0021] Specifically, the pressure transmitter presets a positive pressure value, the feed pressure of the low-pressure feed pump 3 to the gear pump 2 is consistent with the preset positive pressure value, and the pressure transmitter monitors the pressure at the feed port of the gear pump 2 in real time to ensure that the system operates within a safe range.

[0022] In some embodiments, a controller is also included, and the controller is electrically connected to the low-pressure feed pump 3 and the pressure transmitter.

[0023] Specifically, the controller can use a programmable logic control (PLC) to achieve automatic control. By automatically adjusting the operation of the low-pressure feed pump 3, the system pressure is kept stable and the production efficiency is improved. The controller controls the low-pressure feed pump 3 to adjust the feed pressure according to the pressure data provided by the pressure transmitter.

[0024] In some embodiments, the low-pressure glue injection machine further includes an accumulator, which is connected to a pipeline of a feed port of the gear pump 2 to reduce pressure fluctuations in the pipeline.

[0025] Specifically, the accumulator has a large volume and can absorb pressure fluctuations. It reduces pressure fluctuations in the pipeline, protects the gear pump 2 and the pipeline system, and extends the life of the equipment. The accumulator can be a piston accumulator, which reduces the pressure fluctuations on the feed port side of the gear pump 2. The accumulator can be electrically connected to the controller.

[0026] In some embodiments, the low-pressure glue injection machine further includes a thermal relay, which is arranged on the gear pump 2 and / or the low-pressure feed pump 3 .

[0027] Specifically, the current passes through the heating element of the thermal relay. When the current exceeds the set value, the heat generated by the heating element causes the bimetallic strip to bend, thereby disconnecting the circuit. The thermal relay can protect the motors of the gear pump 2 and the low-pressure feed pump 3 to ensure the safety of the pump.

[0028] In some embodiments, the low-pressure glue injection machine further includes a safety valve, which is arranged on the pipeline at the outlet of the gear pump 2 .

[0029] Specifically, the safety valve is set with a fixed opening pressure, and it will automatically open once the pressure is exceeded. When the system pressure rises abnormally, the safety valve can release the pressure in time to prevent equipment damage and safety accidents.

[0030] In some embodiments, the low-pressure glue injection machine further includes a filtering device, which is located on the pipeline between the low-pressure feeding pump 3 and the gear pump 2 .

[0031] Specifically, the filtering device filters the material and effectively intercepts impurities, thereby ensuring the purity of the material, preventing the gear pump 2 and the glue injection gun head from being blocked, and improving the glue injection quality.

[0032] In some embodiments, the filtering device includes a filtering barrel, a filtering net is arranged in the filtering barrel, the filtering net is detachably connected to the filtering barrel, and an inlet and an outlet are arranged at the top and the bottom of the filtering barrel respectively.

[0033] Specifically, there can be multiple filter screens, and the specifications and mesh sizes of the filter screens can be different. When multiple filter screens work simultaneously, uninterrupted filtration can be achieved by replacing a single filter screen. The gear pump 2 feeds the material into the inlet at the top of the filter barrel and leaves the outlet at the bottom of the filter barrel to enter the glue injection gun head. The filter barrel can be made of transparent material or a liquid level meter can be arranged to facilitate observation of the amount of material inside the filter barrel.

[0034] In some embodiments, the low-pressure glue injection machine further includes two pressure sensors, which are respectively arranged at the inlet and the outlet to detect the pressure difference of the filter barrel.

[0035] Specifically, by detecting the inlet and outlet pressure difference of the filter barrel, the filter screen blockage is monitored in real time and maintenance is performed in time. The difference in pressure values ​​measured by the two pressure sensors reflects the blockage of the filter barrel. When the difference is greater than the safety range, the filter screen in the filter barrel is replaced.

[0036] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0041] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A low-pressure glue injection machine, characterized in that: include: A material tank, wherein the material tank has a negative pressure; A gear pump, wherein the first end of the gear pump is connected to the material tank through a pipeline, and the second end of the gear pump is connected to the glue injection gun head through a pipeline for supplying material to the glue injection gun head. A low-pressure feed pump is located on the pipeline between the gear pump and the material tank, and is used to extract the material in the material tank and convey the material to the gear pump at a positive pressure.

2. The low-pressure glue injection machine according to claim 1, characterized in that: It also includes a pressure transmitter, which is located at the feed port of the gear pump and is used to detect the pressure of the feed port of the gear pump.

3. The low-pressure glue injection machine according to claim 2, characterized in that: The device also includes a controller, which is electrically connected to the low-pressure feed pump and the pressure transmitter.

4. The low-pressure glue injection machine according to claim 1, characterized in that: An accumulator is also included, and the accumulator is connected to the pipeline of the feed port of the gear pump to reduce pressure fluctuations in the pipeline.

5. The low-pressure glue injection machine according to claim 1, characterized in that: It also includes a thermal relay, which is arranged on the gear pump and / or the low-pressure feed pump.

6. The low-pressure glue injection machine according to claim 1, characterized in that: It also includes a safety valve, which is arranged on the pipeline at the outlet of the gear pump.

7. The low-pressure glue injection machine according to claim 1, characterized in that: It also includes a filtering device, which is located on the pipeline between the low-pressure feed pump and the gear pump.

8. The low-pressure glue injection machine according to claim 7, characterized in that: The filtering device comprises a filtering barrel, a filtering net is arranged in the filtering barrel, the filtering net is detachably connected to the filtering barrel, and an inlet and an outlet are respectively arranged at the top and the bottom of the filtering barrel.

9. The low-pressure glue injection machine according to claim 8, characterized in that: It also includes two pressure sensors, which are respectively arranged at the inlet and the outlet to detect the pressure difference of the filter barrel.

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